currently there are 2 perazzi release triggers f/s, a Bowen and an Allem. My question is, are these triggers orginal perazzi triggers modified by Bowen and Allem? or are these completly after market trigger groups made by these companys?

These would be conversions of the original Perazzi trigger assembly. Precision Trigger makes their own trigger assemblies. I have a very old McDaniels leaf spring trigger that was built from Perazzi factory release parts and assembled by McDaniels.